How do osteocytes maintain bone tissue?

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Internal structure of a human long bone — bone A long bone of the human body, showing a magnified cross section of the interior.

Osteocytes maintain bone tissue by acting as the primary regulators of bone remodeling and mineral homeostasis.1

Embedded within the mineralized matrix, these cells form an extensive lacuno-canalicular network that allows them to communicate with one another and exchange nutrients, waste, and biochemical signals. Through this network, osteocytes perform several critical functions:1

Mechanical Sensing: They detect mechanical stress and forces, signaling the body to adjust bone strength in response to physical activity or inactivity.1
Remodeling Coordination: They regulate the activity of osteoblasts (which form bone) and osteoclasts (which resorb bone) by secreting signaling molecules like sclerostin, RANKL, and osteoprotegerin.1
Mineral Regulation: They help maintain calcium and phosphate balance, including the secretion of fibroblast growth factor 23 (FGF23) to control vitamin D metabolism.1

Because they are essential for these processes, the dysfunction or death of osteocytes can lead to skeletal disorders such as osteoporosis.1